The issue seems to be the power state of the monitor. Full report at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=801146
** Bug watch added: Debian Bug tracker #801146 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=801146 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1493921 Title: X server fails to set correct mode on resume from sleep (NVIDIA: Setting a mode on head 0 failed: An invalid mode was requested) Status in xorg package in Ubuntu: Incomplete Bug description: Using a really picky Dell P2415Q monitor through DP->mDP (displayport -> mini displayport) cable, nvidia binary driver version 352.30-0ubuntu1. This is not a laptop, so the Intel integrated VGA is disabled. (No other cards in sysfs.) Really nasty bug, as every time all the running applications detect that the X server went away and exit, logind terminates the session culling everyone, and so on. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: xorg 1:7.7+7ubuntu4 ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0 Uname: Linux 4.2.0-7-generic x86_64 NonfreeKernelModules: nvidia .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 352.30 Tue Jul 21 18:53:45 PDT 2015 GCC version: gcc version 5.2.1 20150825 (Ubuntu 5.2.1-15ubuntu5) ApportVersion: 2.18-0ubuntu9 Architecture: amd64 Date: Wed Sep 9 17:56:53 2015 DistUpgraded: 2014-08-06 01:18:55,244 DEBUG enabling apt cron job DistroCodename: wily DistroVariant: ubuntu GraphicsCard: NVIDIA Corporation GK104 [GeForce GTX 760] [10de:1187] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Gigabyte Technology Co., Ltd Device [1458:3614] MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-7-generic root=UUID=fba348ec-fc7c-4c7f-b78b-026be76c4568 ro crashkernel=384M-:128M crashkernel=384M-:128M SourcePackage: xorg UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: Upgraded to wily on 2014-08-05 (399 days ago) dmi.bios.date: 10/24/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F18 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: Z77X-UD3H dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF18:bd10/24/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ77X-UD3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. version.compiz: compiz N/A version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.64-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.6.3-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.6.3-1ubuntu1 version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu5 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3 xserver.bootTime: Wed Sep 9 15:10:08 2015 xserver.configfile: default xserver.devices: input Power Button KEYBOARD, id 6 input Power Button KEYBOARD, id 7 input Logitech G100s Optical Gaming Mouse MOUSE, id 8 input AT Translated Set 2 keyboard KEYBOARD, id 9 xserver.errors: open /dev/fb0: No such file or directory xserver.logfile: /var/log/Xorg.0.log xserver.outputs: xserver.version: 2:1.17.2-1ubuntu5 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1493921/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp